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4) Can you infer what the meaning of "stability" measure of modules is in software engineering concept, and what is the purpose?

4) Can you infer what the meaning of "stability" measure of modules is in software engineering concept, and what is the purpose?

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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(4) Can you infer what the meaning of "stability" measure of modules is in software engineering concept, and what is the purpose?
Transcribed Image Text:(4) Can you infer what the meaning of "stability" measure of modules is in software engineering concept, and what is the purpose?
Suppose you are going to design an instant messaging application called Telegraph. Telegraph is a modularized application composed of UI module, Chat module, and Contact module. The UI module uses the Chat module and the Contact module to render the user interface. The Chat module deals with sending and receiving messages. The Chat module uses the Network module for network communication. When users send/receive messages via the network, the Chat module uses the Crypto module to encrypt/decrypt the message. The Contact module manages the contact list. It also uses the Crypto module for encryption/decryption. The Crypto module uses the Math module for calculation. Now we propose a metric to measure the stability of modules. Formally, we define the "stability" of a module i as Si = a+dut where di" (i.e., incoming connection or dependency) is the number of modules that directly or indirectly USES module i and d?ut (i.e., outgoing connection or dependency) is the number of modules that module i directly or indirectly USES. For example, Figure 2-1 shows module X, that is used by three modules, so d = 3 and dout = 0. Thus, module x should be unlikely to change because it has three incoming dependencies. Conversely, in Figure 2-2, module Y uses three modules, i.e., dgut = 3, so it is more likely to change due its three outgoing dependencies. If a USES b and b USES c, then din = 2. USES USES USES module X Figure 2-1: Three modules USES module X module Y USES USES USES Figure 2-2: Module Y USES three modules
Transcribed Image Text:Suppose you are going to design an instant messaging application called Telegraph. Telegraph is a modularized application composed of UI module, Chat module, and Contact module. The UI module uses the Chat module and the Contact module to render the user interface. The Chat module deals with sending and receiving messages. The Chat module uses the Network module for network communication. When users send/receive messages via the network, the Chat module uses the Crypto module to encrypt/decrypt the message. The Contact module manages the contact list. It also uses the Crypto module for encryption/decryption. The Crypto module uses the Math module for calculation. Now we propose a metric to measure the stability of modules. Formally, we define the "stability" of a module i as Si = a+dut where di" (i.e., incoming connection or dependency) is the number of modules that directly or indirectly USES module i and d?ut (i.e., outgoing connection or dependency) is the number of modules that module i directly or indirectly USES. For example, Figure 2-1 shows module X, that is used by three modules, so d = 3 and dout = 0. Thus, module x should be unlikely to change because it has three incoming dependencies. Conversely, in Figure 2-2, module Y uses three modules, i.e., dgut = 3, so it is more likely to change due its three outgoing dependencies. If a USES b and b USES c, then din = 2. USES USES USES module X Figure 2-1: Three modules USES module X module Y USES USES USES Figure 2-2: Module Y USES three modules
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